Hmm..

That is prob beyond my expertise. I actually started out with MG soil and quickly got away from it due to the info available here about much better soil options, that and that I found a local hydro shop with Fox Farms that was actually cheaper than the MG when I got it. Go figure...

What I would do today with MG pre-nuted soil? I'd flush the living hell outta it at least once before I added anything else in the first 6 weeks or so.

BTW there is a few around here that use MG soil and claim to have used it for years w/o any probs, maybe one of them might chime in with help.

Also, I have used MG for quite some time for veggies and houseplants. Never had too many probs but since I've started messing with cann I've even got away from MG all together. My wife's African Violets seems to do better in FF than MG but we aint talkin cannabis here either